Aircraft overview

The Learjet 23 / 24 / 25 family represents the first generation of Learjet light business jets, developed by Lear Jet Corporation and later Gates Learjet. The Learjet 23 first flew in 1963 and entered production in 1964. The Learjet 24 followed as a higher weight, certificated development, while the Learjet 25 added a stretched fuselage for more cabin capacity. Production of these early models ran from the mid 1960s into the early 1980s. For buyers, the family matters because it established the small, fast business jet format: two pilots, compact cabin, high cruise speed, and jet performance from relatively small airframes.

Performance & specifications

Performance varies by model and modification status, but these aircraft are known for fast cruise in the mid 400 knot range and certified ceilings up to 51,000 feet on many Learjet 24 and Learjet 25 variants. Typical range is generally around 1,200 to 1,700 nautical miles, depending on fuel, payload, reserve policy, and variant. Useful load is model specific and should be verified from the individual weight and balance record. Power comes from General Electric CJ610 turbojet engines, with later variants using higher rated versions. The design has strong climb performance, but fuel burn and noise characteristics reflect 1960s turbojet technology rather than modern turbofan efficiency.

Cabin & avionics

The cabin is compact and not stand-up height. The Learjet 23 is typically configured for a small number of passengers, while the Learjet 24 usually seats up to six and the stretched Learjet 25 can accommodate more, commonly six to eight depending on layout. Baggage capacity is limited compared with later light jets, and lavatory provisions vary by model and interior configuration. Original avionics were analog, commonly based on Collins, King, or similar period equipment. Many surviving aircraft have been upgraded with Garmin GNS or GTN navigators, modern transponders, ADS-B equipment, updated audio panels, weather radar, and autopilot improvements. Garmin G1000 or Garmin Perspective is not a typical factory suite for these aircraft.

Buying & value

In the used market, the Learjet 23 / 24 / 25 is usually positioned as a low acquisition cost, high performance classic jet, not as a low operating cost aircraft. Buyers should focus on complete logbooks, corrosion history, inspection status, engine cycle and life limits, hot section documentation, fuel tank condition, pressurization system health, landing gear records, and compliance with RVSM, ADS-B, and noise requirements. Important variants include the Learjet 24B, 24D, 24E, 24F, and Learjet 25B, 25C, 25D, 25F, and 25G. Avionics modernization and interior condition can affect usability, but engine support, regulatory compliance, and maintenance history usually drive value most strongly.